Effects of Strength and Conditioning on Maximal Isometric Strength, Motor Unit Behavior, and Concentric Isokinetic Peak Torque in Middle-School Boys'

The purpose of this investigation was to examine the covariate influence of estimated muscle mass on age-related increases in isokinetic peak torque for flexion and extension of the forearm and leg in high school wrestlers. One hundred thirteen high school wrestlers volunteered to be measured for strength at 30, 180, and 300°·s−1. Underwater weighing was performed to determine body composition characteristics, and the anthropometric equation of Martin et al. (10) was used to estimate total skeletal muscle mass (MM). There were significant (p < .05) relationships (r = .19 to .37) for age versus peak torque covaried independently for fat-free weight (FFW) and MM for forearm flexion at 30, 180, and 300°·s−1; forearm extension at 180 and 300°·s−1; and leg extension at 30, 180 and 300°·s−1. The results of this study indicated that there was no increase across age in MM per unit of FFW, and the age-related increases in peak torque in high school wrestlers could not be fully accounted for by changes in MM.

Download Full-text

Muscle Strength Variations of Knee Joint Muscles in Elite Female Handball Players after Pre-Season Conditioning

Journal of Human Kinetics ◽

10.2478/hukin-2018-0011 ◽

2018 ◽

Vol 63 (1) ◽

pp. 105-115 ◽

Cited By ~ 2

Author(s):

Zuzana Gonosova ◽

Petr Stastny ◽

Jan Belka ◽

Lucia Bizovska ◽

Michal Lehnert

Keyword(s):

Muscle Strength ◽

Elite Athletes ◽

Body Height ◽

Peak Torque ◽

Knee Extension ◽

Training Process ◽

Strength Performance ◽

Risk Of Injury ◽

Previous Season ◽

Isokinetic Peak Torque

Abstract Monitoring seasonal variations in strength performance and the relative risk of injury indicators related to strength of hamstring (H) and quadriceps (Q) in female elite athletes is beneficial for the training process. The aim of this study was to examine and compare the level of muscle strength, the conventional ratio (HCONC/QCONC) as well as two functional and strength ratios reflecting the movement of knee extension (HECC/QCONC) and flexion (HCONC/QECC), and the bilateral percentage strength deficit (BSD) in elite female handball players. The concentric and eccentric isokinetic peak torque was measured at an angular velocity of 60°/s on three occasions (in-season cessation, 4 weeks of rest followed by 4 weeks of individual conditioning and 6 weeks of group conditioning) in eleven female handball players (age: 23.1 ± 3.5 years, body height: 1.73 ± 0.6 m). According to ANOVA results, the BSD of H muscles in the concentric mode decreased between the in-season cessation and the end of the pre-season, and HCONC/QCONC increased at the beginning of the pre-season and at the end of the pre-season in comparison with inseason cessation measurement. The effect size analyses showed that the off-season rest followed by 10 weeks of the conditioning programme increased Q and H strength in comparison with the previous season with a large effect. Coaches should include progressive conditioning in the pre-season phase to decrease the bilateral strength deficit and to support further conditioning development.

Download Full-text

Relationship of Isokinetic Peak Torque With Work and Power for Ankle Plantar Flexion and Dorsiflexion

Journal of Orthopaedic and Sports Physical Therapy ◽

10.2519/jospt.1995.22.3.113 ◽

1995 ◽

Vol 22 (3) ◽

pp. 113-115 ◽

Cited By ~ 26

Author(s):

Chrissy Woodson ◽

William D. Bandy ◽

Daniel Curis ◽

Darren Baldwin

Keyword(s):

Plantar Flexion ◽

Peak Torque ◽

Relationship Of ◽

Ankle Plantar Flexion ◽

Isokinetic Peak Torque

Download Full-text

The Comparison Study between Isotonic Maximum Strength(IRM) and Isokinetic Peak Torque at the Knee Joint

Journal of Sport and Leisure Studies ◽

10.51979/kssls.2002.11.18.1009 ◽

2002 ◽

Vol 18 ◽

pp. 1009-1016

Author(s):

Sung Soo Kim ◽

Jae Hyun Yoo ◽

Yong Suk Jee ◽

Kwang Wook Yoo ◽

Young Je Sim ◽

...

Keyword(s):

Knee Joint ◽

Peak Torque ◽

Maximum Strength ◽

Comparison Study ◽

Isokinetic Peak Torque

Download Full-text

Reliability of measuring isometric and isokinetic peak torque, rate of torque development, integrated electromyography, and tibial nerve conduction velocity

Archives of Physical Medicine and Rehabilitation ◽

10.1016/0003-9993(94)90279-8 ◽

1994 ◽

Vol 75 (12) ◽

pp. 1315-1321 ◽

Cited By ~ 72

Author(s):

Gordon G. Sleivert ◽

Howard A. Wenger

Keyword(s):

Conduction Velocity ◽

Nerve Conduction ◽

Nerve Conduction Velocity ◽

Tibial Nerve ◽

Peak Torque ◽

Rate Of Torque Development ◽

Torque Development ◽

Isokinetic Peak Torque

Download Full-text

Comparison of Isometric Portable Fixed Dynamometry to Isokinetic Dynamometry for Assessment of Hip Strength

International Journal of Athletic Therapy & Training ◽

10.1123/ijatt.18.6.1 ◽

2013 ◽

Vol 18 (6) ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Roger O. Kollock ◽

Bonnie Van Lunen ◽

Jennifer L. Linza ◽

James A. Onate

Keyword(s):

Outcome Measures ◽

Pearson Correlation ◽

Correlation Coefficients ◽

Peak Torque ◽

Hip Strength ◽

Isokinetic Testing ◽

Testing Procedures ◽

Hip Motion ◽

Torque Values ◽

Isokinetic Peak Torque

Context:Assessment of hip strength can be performed with either isokinetic or isometric testing procedures, but the degree of association between values derived from the alternative testing methods has not been previously documented.Objective:To investigate the relationship between isometric peak torque and isokinetic peak torque at 60°·s-1 for various hip motions.Participants:Eighteen physically active males (N = 9) and females (N = 9) participated (22 ± 3 years, 173.0 ± 10.5 cm, 73.8 ± 16.7 kg).Intervention(s):Three isokinetic repetitions at 60°·s-1 and three isometric contractions of 5 s each for the hip fexors (HFs), hip extensors (HEs), hip abductors (ABs), hip adductors (ADs), hip external rotators (ERs), and hip internal rotators (IRs).Outcome Measures:Pearson correlation coefficients and coefficients of determination were calculated for both absolute and allometric-scaled peak torque values.Results:Meaningful associations between isometric and isokinetic peak torque values were found for each hip motion. Allometric-scaled strength values demonstrated stronger correlations than absolute strength values.Conclusions:The results suggest that portable fixed isometric testing of hip strength is an alternative to isokinetic testing at 60°·s-1.

Download Full-text